Investigation of wake flow characteristics of a splitter plate with different porosity behind a vertical cylinder

Researcher studies on flow over bluff bodies for understanding wake flow physic and the cylinders are widely used for experiments due to their basic geometry and large number of technical applications like heat exchanger tubes, cooling systems for nuclear power plants, power transmission lines, chimney stacks, bridges, buildings, radio telescopes, power lines, offshore drilling rigs, underwater pipelines, marine cables etc. Submerged hydrodynamics is a general term used to describe the hydrodynamics of floating or stationary structures that cause flow separation. A continuous flow causes periodic vortex fluctuations around the sinking object. When the vortex fluctuates behind the object, the drag force on the object increases and periodic forces are generated perpendicular to the flow direction on the object. These periodic forces cause structural vibrations and acoustic noise or resonance. At the same time vortexes increases the mixing behind the flow and in this way, the heat transfer also increases. Learning to control the vortex fluctuations can reduce the noise level by increasing energy efficiency. In this study, it is aimed to examine passive flow behind the cylinder passively with different permeability separator plates, using particle imaged velocity measurement (PIV) technique. Experiments have been carried out at Cukurova University, Mechanical Engineering Department, Fluid Mechanics Laboratories. According to the results obtained, the effects of the permeability ratio β, the separator plate length, the distance between the plate cylinder and the separator plate cylinder axis, the effects on the vortex formation behind the cylinder and the turbulence statistics of the flow (Turbulence Kinetic Energy) have been revealed.